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blit_transparent_noclip_tasm.cpp

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#ifdef USE_TASM

void blit_transparent_noclip_asmbpp(unsigned char *src, unsigned short *dest, unsigned int width)
{
asm
{
ALIGN 8
blit_transparent_noclip_asm_16bpp:
        push            esi                     ;; save used registers (5)
        push            edi
        push            eax
        push            ecx
        push            edx

        mov             esi, [esp+20+4]         ;; load registers
        mov             edi, [esp+20+8]
        mov             edx, [esp+20+12]

        xor             ecx, ecx                ;; make sure upper part of register is zero
ALIGN 4
.cmd_copy:
        mov             cx, [esi]               ;; read rep
        sub             edx, ecx
        add             esi,  2

        shr             ecx, 1
        rep             movsd                   ;; copy all dwords

        jnc             .end_copy
        mov             ax, [esi]
        mov             [edi], ax
        add             esi,  2
        add             edi,  2

.end_copy:
        and             edx, edx
        jz              .rle_done

.cmd_skip:
        mov             cx, [esi]               ;; read rep
        add             edi, ecx                ;; do the skip
        add             esi,  2
        add             edi, ecx                ;; (x2 because dest is word)

        sub             edx, ecx                ;; width -= rep
        jnz             .cmd_copy

.rle_done:

        pop             edx                     ;; restore used registers
        pop             ecx
        pop             eax
        pop             edi
        pop             esi

        ret
}
}


void blit_transparent_noclip_asm_32bpp(unsigned char *src, unsigned int *dest, unsigned int width)
{
asm
{
ALIGN 8
blit_transparent_noclip_asm_32bpp:
        push            esi                     ;; save used registers
        push            edi
        push            ecx
        push            edx

        mov             esi, [esp+16+4]         ;; load registers
        mov             edi, [esp+16+8]
        mov             edx, [esp+16+12]

        xor             ecx, ecx                ;; make sure upper part of register is zero

.cmd_copy32:
        mov             cx, [esi]               ;; read rep
        add             esi,  2
        sub             edx, ecx

        rep             movsd                   ;; copy all dwords
        jz              .rle_done32

.cmd_skip32:
        mov             cx, [esi]               ;; read rep
        lea             edi, [edi + 4*ecx]      ;; do the skip (x4 because dest is word)
        add             esi,  2

        sub             edx, ecx                ;; width -= rep
        jnz             .cmd_copy32

.rle_done32:

        pop             edx                     ;; restore used registers
        pop             ecx
        pop             edi
        pop             esi

        ret
}
}

#endif
 

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